21043077 has 8 divisors (see below), whose sum is σ = 30608160. Its totient is φ = 12753360.

The previous prime is 21043069. The next prime is 21043097. The reversal of 21043077 is 77034012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21043077 - 2³ = 21043069 is a prime.

It is a super-2 number, since 2×21043077² = 885622179255858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318802 + ... + 318867.

It is an arithmetic number, because the mean of its divisors is an integer number (3826020).

Almost surely, 2^21043077 is an apocalyptic number.

It is an amenable number.

21043077 is a deficient number, since it is larger than the sum of its proper divisors (9565083).

21043077 is a wasteful number, since it uses less digits than its factorization.

21043077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637683.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21043077 is about 4587.2733731488. The cubic root of 21043077 is about 276.0809335218.

Adding to 21043077 its reverse (77034012), we get a palindrome (98077089).

The spelling of 21043077 in words is "twenty-one million, forty-three thousand, seventy-seven".